I think that with AT05, there were set ideas in Ayu's head.. of where each song would go and how they would play out..
Perhaps it was "all planned from the start". Whereas for AT06, she sort of changed things as she went by..
I mean she DID start with a song called.. HAPPY
ENDING. :3
I do hope that she uses the stage more in the next tour though..
In combination with the screens maybe?
[I'm guessing that the screens + that rain thing cost a ton.. >3<]